Replaced groups.ipaserver[0] by ansible_fqdn.

Since we are using docker for running the tests we can no longer rely on
groups.ipaserver[0] as the managed host hostname.

tests/external-signed-ca-with-automatic-copy/install-server-with-external-ca-with-automatic-copy.yml

@@ -12,7 +12,6 @@
 
 - name: Create CA, get /root/ipa.csr signed by your CA, ..
   hosts: localhost
-  gather_facts: false
 
   tasks:
   - name: Run external-ca.sh